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Original question:

BQ25730: Integrated USB C Battery Charging Solution

USB-PD-CHG-EVM-01: High Power USB-C Power Path charging IC for 5s Lion Battery Pack Suggestion

Roy Yang
Prodigy 50 points
Part Number: USB-PD-CHG-EVM-01
Other Parts Discussed in Thread: BQ25730, TPS25750, LM5155, LM5156

Hi TI experts,

I am designing a device that run off a 5 to 6 cells of Lion 18650 batteries (18-21.6v 2600mah per cell). I am looking into using USB-C interface (20v 5A 100w) to power the load as well as charging the batteries. And I found this evaluation board from TI, USB-PD-CHG-EVM-01. It seems like what I need but only support up to 4 cells. Do you have a updated design on this with higher cell number support? And if not, is there any DC/DC boost converter recommended for boosting the output load voltage to 54v?

A few specifications regarding my design:

  • Max output power 100w
  • Max input power 100w
  • Battery: 5-6s Lion 18650 batteries (18-21.6v 2600mah per cell)
  • Power Path for charging while using
  • USB-C charger: 100w 20v 5A
  • Battery could power the system without having a USB-C charger plugged in (Is this the OTG function? Correct me if I am wrong.)

Kind regards,

Roy

  • 0
    TI__Guru**** 165886 points

    Hi Roy,

    Unfortunately, we do not have such a reference design.  We have a 5 cell buck-boost charge controller with external FETs, BQ25730.  In theory, firmware could written to control the BQ25730.  The BQ25730 could then charger the 5 cells in forward/charge mode or provide power to its input pins (USB-C port) while running in OTG/reverse mode.  The TPS25750 team would have to help with the firmware.  

    I am not familiar with the boost converter portfolio so I will move this thread to that team. 

    Regards,

    Jeff

  • 0
    TI__Mastermind 22365 points

    Hi Roy,

    If you consider boost 21.6V to 54V/100W, you may consider LM5155/LM5156.

    Please feel free to reach out if you have further request.

    Best Regards,

    Feng Ji

  • 0 in reply to Feng Ji
    TI__Guru 58521 points

    Hi Roy,

    I have not seen an update for the last 14 days, so I assume the questions are/or answered and the issue is solved.
    I close this thread now. If there is still something open reply and the thread will get open again.
    If you have any other question or of the thread gets locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,
    Stefan